Means for indicating electrical overloads



July 12, 1927. J. SAMPER MEANS FOR INDICATING ELECTRICAL OVERLOADS Filed Jan. 17, 1925 2 Sheets-Sheet 1 17311 1. Fly 2 5 .ZEza-e 72/250 7 E7: a/me7 'July 12, 1927.

' 1,635,348 J. SAMPER MEANS FOR INDICATING ELECTRICAL OVERLOADS Filed Jan. 17, 1925 2. Sheets-Sheet 2 Jzwe 1 Qf6am Patented July 12, 1927.

NITE S'ES JoAQUI n SAMPEB, or BOGOTA,-COLCMBIA. 1 V

MEANS non INDICAT'ING ELEC RICAL" ovnanonns.

Application filed January 17, 1925, SerialNo.

' the device is fitted has been subjected to 'a greater load than th at contracted or stipulated between the customer and the firm, company or concern supplying the electric service.

In such devices as heretofore proposed the solenoid core has been secured to a pivoted switch which is normally closed but is opened by .the movement of the core caused by excess load in the installation whereupon the current is shunted through an electrical lamp circuit, the parts remaining in this position and only returning to normal when the current taken off decreasesto the predetermined limit. I

According to invention the parts of a two-part contact'are separated by the direct 1 action of the solenoid core on one of'them,

' the displaced part being held in the out-ofaction position by a hook which automatr 'cally falls into position under the displaced part of the contact, the device being returned to the normal only when the hook is released.

Two methods of carrying out my invention are used. In the first case the apparatus, when receiving an overload, ignites the lamp without cutting off the supply to the installation, but leaving a visual indication that the predeterminedload has been ex-' ceeded.- In the second case the apparatus,

operator again returns the installation to its normal working condition.

The invention is illustrated in the accompanying drawings wherein Figs. 1 and 2 are respectively front and side elevations of the first form of the apparatus and Fig. 3 is a diagram showing the electrical circuits, of the same; and

Figs. 4 to 6 are similar views of the modified form of the apparatus. I v The same parts are lettered to correspond in all the figures. 1

Referring first to Figs. 1 to 3. A 'is a coil of wire, woundv on a bobbin, in series with the electrical installation used, and within the bobbin is movably mounted a soft iron core H. a

One end of the wire- A is connected with In both cases the lamp remains alight until the 3,121, and in Grcat Britain 0ctober'13, 1924.

the supply line I by screws 2 and 3; the

other end passes through a connection 4: to a contact piece l/Vhen the installation is working normally the current from the supply line 1, passes through the coil A and thence tothe 7 contact piece M, which is in contact with a movab'lejm'ember K, and from there through a connection 5 to the installation,

passing-through a switch S outs de theapparatus direct to the installation. The supply linel has a branch line 8 terminating in a contact piece E located in thepath of a contact plate F carried by the movable member K; and the return line 6'from the installation, has a branch line 7 passing through c a lamp L, which forms part of the apparatus, and'terminatingin a contact piece D, which is also located in the path of. the plate F 011 "the movable'membenK, K Kare guides, fiXed to the apparatus, between which the member K moves. u I 1 Now if the installation'is'subjected to an overload, i. e.,to a load beyond the predetermined limit, the soft i'roncore H becomes sufficiently magnetized to raise and hold up the movablemember K which upon being raised breaks the contact at M, and 'establishes connection between the contacts D and 'E bymeans of. thecontact plate F. B is a. hook pivoted to some fixedpart of the ap- -paratus and lying in the path of the member K. The moment the member K is raised, the hook engages its'undersurface and main tains the member K in the raised position until released. y

Upon examining the diagram (Fig. 3) it will be seen that, when the con tact'is broken at M, the coil A is cutout of} the circuit Whilst the member K establishes another path for the current to the'installation which then passes from the supply line 1 through the branch line 8 to the contact E, and from there through the movablemember K to the installation, without the supply being interrupted except momentarily during the moveof this form is as follows :-If a greater supply of current is taken than the predetermined limit for which the apparatusis set, the core H rises and breaks the circuit at the contact M by raising the movable member K (Fig. 6) thus throwing theinstallation out of circuit. Secured to the member ,K, but electricallyinsulated therefrom, is ametallic member G which establishes connection between the contactsD and E,thereby ignitsure on the spring member C, which acts on the hook. v a .7

In both types of apparatus the hookB is in a locked box under the control of the operators. The two types of apparatus are adjustable, within the limits of their-capacity, for a determined load, and this is effected by unscrewing the set screw from the collar J located in the lower part of the guideltube tor the core and adjusting said collar so as to raise or lower the initial position of the core.

I claim: y

I 1. In a device for indicating electrical overloads, a supporting base, a normally contacting' fixed contact and a movable contact carried by the base, additional fixed contacts '-to be'bridged by'the movable contact'when displaced from the normal position, one of 7 an electrical source through a signal, oversaidadditional contacts being in circuit with load operated electromagnetic means for .moving said movable contact from its normal position to 1ts contact bridglng position, r

the first mentioned fixed contact, the movable contact, and the electromagnetic means a carried by the base,'ad-ditional fixed contacts to be bridged by the movable contact when displaced from the normal position, one of said additional contacts being in circuit with an electrical source through a signal, over load operated electromagnetic means for moving said-movable contact from its normal position to its contact bridging position, and means for retaining the movable contactin the bridging position,-the' first men'- tioned fixed contact, the movable contact, and the electromagnetic means being in series with the electrical load.

3.-.In a device for indicating electrical overloads, a supporting base, a normally contacting fixed contact and a movable contact carried by the base, additional fixed contacts to be bridged by the movable contact when displaced from the normal position, one of said additionalcontacts being in. circuit with f an electrical source througha signalfoverload operated electromagnetic 'means for moving said movable contact from its normal ,7

position to its contact bridging position, and 7 an automatically acting hook for maintaining the movable contact in the bridg ng position, the first mentioned fixed contact, the movable contact, and the electromagnetic,

means being in series with the'electrical load. l

In testimony whereof I have: hereunto set 7 my hand this twelfth day of Decemberyl92'l.

. JOAQUIN sin/Inna. 

